This method is especially useful for those who cannot afford to buy a large amount of bitcoins at once but are willing to invest in bitcoins. Only they can invest in this method and buy bitcoins in small amounts and hold it according to their specific goals.
The DCA method is not only for those who want to buy Bitcoins but cannot buy them all at once due to lack of funds. The DCA method is for anyone who wants to invest in Bitcoin. Everyone knows that Bitcoin market is the most volatile market. If you are a true investor, you definitely don't want your money to be lost after investing. To catch up with what you said I would have had to go back another 8,9 months and invest when bitcoin was $35k,$36k. But now the price has reached $70k! Now what if someone invests a large sum of money at once, and 2 days later the price of Bitcoin drops to $40k? Have you thought about that? I think no investor can think like that.
I think, DCA is a good method many investors are using to accumulate Bitcoin in their portfolio, because they can use any amount of funds to purchase Bitcoin and hold for long term before they can sell to increase their capital that will make them to purchase more of Bitcoin in the future. I have tested Bitcoin and other cryptocurrencies investment, I came to discovered that Bitcoin investment is the best investment investors need to give serious attention to, because Bitcoin price makes other cryptocurrencies price to increase when there is a bullish season which is the season for investors to accumulate income from the market. Yes, I thought about that few days ago when the price of Bitcoin hit $70,000 which is the reason investors don't need to purchase Bitcoin now, because the price is too high for investors to purchase huge amount of Bitcoin, but if they can wait for the price to decrease back to $40,000 before they can purchase, I think it will allow them to achieve huge amount of Bitcoin.